It would seem in fact that nervous invalids expose fissures in the soul's envelope whereby the Spirit of Evil effects an entrance.
But this is a riddle that remains unsolved; the word hysteria explains nothing. It may suffice to define a material condition, to mark
invincible disturbances of the senses.

But what are the details and attendant circumstances of this malady of sinfulness? In what degree is the responsibility diminished of the
individual whose soul is attacked by a sort of daemonic possession, that takes root in the disorganization of his unhappy body?